Electric incubator heater



April 28, 1925.

C. HAMILTON ELECTRIC INCUBATOR HEATER- FiledFeb. 28. 1924 2 Sheets-Sheet .L

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April 28, 1925. 1,535,829

l c. HAMILTON ELECTRIC INCUBATOR HEATER Filed Feb. 28, 1924 2 Sheets-Sheet 2 PAT E NT 0F F I-*C E.

CLAUDE HAMILTON, OF' GARNETT, KANSASLH ELECTRIC INCUBATOR HEATER.

Application filed February 28l 1924;

To @ZZ cti/0022, t 'may concern:

Be itlznoivn that l, CLAUDE IrlaMrL'rov` a citizen ot the Unitedv States, residing,I at Garnett, in the county of Anderson and `dtate ot Kansas, have invented'certain ne\v and useful improvements in Electric Incubator Heaters, of Which the following is a specification.

This invention relates to electric heaters, more particularly to devices `of this class 'em- L loyed in incubatore, and tor like purposes, and has tor one ot its'objects to provide a device et this character which may be installed'in various forms ot incubator-s and like stiuctureaand whereby the heatv is automatically controlled, to provide'a uniform temperature in the egg chamber.`

llt' ith these andother objects in view the invention consists in certain novel features et construction as hereinafter shoWn'and described and then specilically pointed out in the claim, and in the drawings illustrative oi" the preferred embodiment ot' the invention.

Figure 1 is a longitudinal section ofthe improved device.

Figure 9, is a plan vieW in section on the line ot F igure 1 lookingrin the direction ot the arroiv, with the egg tray removed.

Figure 3 is an enlarged sectional detail of the electricallyY operated heat control portion of the improved device.

liigure il is a plan view from beneath, of portions of the device shown in Figure 3, and in section ot' the line 4-4 ot Figure 3.

This uevice comprises an enclosing casing` consisting` orl a rear Wall 10, end Walls 11, bottom 12 and top 13. The front of the casing, comprises end portions 14 and an intermediate closure portionl 15. Extending` transversely of the casingv and spaced from the ends are partitions 16 and 17 dividing the interior into end compartments or closed air chambers 18 and 19 and an intermediate compartment 20, the latter constitilting' the egg' chamber ot' Which the portion 15 is the closure.

The closure 15 is preferably termed with transparent portions 21 to render the interior ot the egg chamber visible Without opening the closure, and the latter is hinged ly united to the casing as shown at 22, to render the egg chamber readily accessible to insert and remove the egg; tray one ot' which is represented at 23.

The outer Walls ot the casing are double Serial No. 695,731.

thick and provided with a n'onconductivc filling as indicated atQ, ot' sawdust or the like, torprotect the contents, in the usual manner.

Gonnected to the inner'face ot. the top 13 andl Within the chamber 20,' is a block Q5 "saluted at 2o from the' casing top and cai yingl a contact 97.

Attached to the inner tace of the" topf13v ofthe easing;` is a hanger QSin'Which an arm 29'is pivoted at 30 intermediate the ends and carries an opposing. contact 31 engaging the contactQ When the arm 29 is in one position as shown in Figurel, and disengagcd therefrom Whenthe armis in an-other position,as shown in Figure Attached at 32 to the inner tace o'f the top 13 1s an angularly directed resilient: arm

lhaving' a threaded aperture 34 and an inthe top 13, and is providedwith means tor rotating the same, such as a screwdriver slit, as' shown; By'this means, the resilient member 33 may be adjusted toward and aivay from the top 13 from the exterior ot the casing.

Bearing loosely7 upon the insulating block is a post member et() connected at its lower side to the loiver portion All ot an expansive member While another post member 48 e3;- tends from the upper portion 4t2 of the expansive member, the latter post member being` longitudinally bored and the bore threaded to receive a threaded rod it with the upper end of the rod pivoted at l5 to the armature bar A guide bracket 46 is attached to the under Yface of the top 13 and is longitudinally slotted to slidably receive the post member el?) and support it from displace ment.

Attached to the under face ot the top 13 of the casing are a plurality ot insulator members et? around which a thin Wire or heating unit. member 48 is Woven baci; and forth, as shown in Figure et. A larger conductor Wire, represented at a9, is connected to the heating` unit ire 48 at one end at 50, While a larger conductor ivire 51 is connected at 52, to the other end ot the smaller ivire 4S.

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yThe conductor 51 is connected at 53 to the armature bar 29, While another largerv pled -at 57 to the ltop 13. The conductors 49 and 54 lead from a source of electric energy, not shown.

The,V element 4 1 42 when at normal temperature, and contracted, holds the post 43 and the rod 44 in their lower position, and the contacts 27 and 3l i-n engagement and the circuit closed, and the member 48 heated by its resistance to the current passing therethrough.

By adjusting the members 33 and 44vthe degree of movement of the element 41-42 may be accurately controlled to correspondingly control the degree of heat. radiated by the element 48. The egg chamber is thus heated to the required degree. If however -theheat rises above the predetermined degree, the element 41-42 by expanding tilts the bar 29 on its pivot 30- and thus breaks the circuit through the conductor elements and, correspondingly reduces the temperature.

vWhen the. temperature decreases to an e-xtent sufficient to cause the element 41-42 to detract, the circuit is again closed and the heating property of the member 48 restored. The temperature of the egg chamber is lthus automatically controlled and retained at a uniform degree.

The dead air chambers 18-19 at the ends of the incubating or egg chamber materi- The two conductor members 49l ally increase the efficiency and utility of the device.

j The device is simple in, construction, can

understood that modifications With-in the scope of the claimed invention may be made in the construction Without departing fromY the principle of the invention or sacrificing any of its advantages.

That is claimed is:

In a device of the class described, a stationary support, a combined supporting rod and adjusting member threaded at one end and mounted for rotation in the stationary support and extending externally of the same, said extended portion having means for the'application of a turning implement., a movable supporting member attached at one end to the stationary support and with a threaded,aperture engaged by the threaded rod, a diaphragm actuated member bearing upon said movable support, a lever arm mounted to saving and with an electric contact at one end and pivoted at the other end to said diaphragm operated means, and an electric contact adapted to be engaged by the Contact of said lever arm When the diaphragm member is expanded, said contacts being connected into an electric circuit.

In testimony whereof, I affix my signature hereto.

CLAUDE HAMILTON. 

